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Results of a prospective study with high-dose etoposide, thiotepa and carboplatin and peripheral blood stem cell rescue for high-risk stage II-IIIA and selected stage IV breast cancer patients.

Tumori 2001 May
AIMS AND BACKGROUND: To investigate the safety and efficacy of a high-dose chemotherapy regimen with etoposide, carboplatin and thiotepa in high-risk stage II-IIIA breast cancer and in responsive metastatic patients.

STUDY DESIGN: From April 1992 to December 1998, 24 patients with high-risk stage II-IIIA breast cancer (> or = 9 positive nodes) and 9 responsive metastatic patients were enrolled in the trial. After induction chemotherapy with an anthracycline-based regimen, peripheral blood stem cells were mobilized with cyclophosphamide (7 g/m2) and G-CSF (5-16 microg/kg/s.c./day). The high-dose chemotherapy regimen consisted of etoposide (1000 mg/m2), carboplatin (800 mg/m2) and thiotepa (500 mg/m2). At the end of the high-dose chemotherapy, all stage II-IIIA patients received radiotherapy to the breast or chest wall and draining nodes; stage IV patients were irradiated to sites of disease, if feasible. All ER+ and/or PgR+ patients were treated with hormone therapy.

RESULTS: For stage II-IIIA high-risk patients, the median follow-up was 4.36 years (range, 1.93-6.94), and the Kaplan-Meier estimate at 5 years of disease-free survival and overall survival was 54.8 +/- 11% SE and 76.73 +/- 9.4% SE, respectively. For metastatic patients, the median follow-up was 4.93 years (range, 4.15-7.95), and the Kaplan-Meier estimate at 5 years of progression-free survival and overall survival was 22.2 +/- 13.9% SE and 76.2 +/- 14.8% SE, respectively. No treatment-related deaths were observed.

CONCLUSIONS: Our results are comparable to those obtained in other high-dose chemotherapy trials but do not seem to be superior to conventional-dose therapy given to similar patients.

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